Abstract: A modular guided traveling vessel power generator system is provided, which has at least a vessel propelled by a fluid current with orientation means, for rotating around a pivoting axis by means of a pivoting element attached to a guiding system configured for guiding the vessel in a linear alternative direction perpendicular to the fluid current. The system has a transforming mechanism configured for transforming the linear movement of the vessel into another movement which drives at least a power generator unit. Additionally, a method for generating power is provided, which comprises pivoting a vessel propelled by a fluid current around a pivoting axis, guiding it in a linear alternative direction perpendicular to the fluid current, and transforming the linear movement of the vessel into another movement which drives at least a power generator unit.